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4c-7=20+c
We move all terms to the left:
4c-7-(20+c)=0
We add all the numbers together, and all the variables
4c-(c+20)-7=0
We get rid of parentheses
4c-c-20-7=0
We add all the numbers together, and all the variables
3c-27=0
We move all terms containing c to the left, all other terms to the right
3c=27
c=27/3
c=9
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